9 40 Further Notes and Views

Back to 9_40.

In three-fold symmetrical form		Symmetrical triangular form		(less open)		(alternate)		Variant
Obtained by an epitrochoid.		Cylindrical depiction.		9.40 as a geodesic line of the oblate spheroid		Photo of an alsatian chair, musée de l'oeuvre Notre Dame, Strasbourg, France.